<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      @click-left="$router.back()"
      title="黑马头条"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">
            {{ article.pubdate | relativeTime }}
          </div>
          <!-- <follow-user
            :is-followed="article.is_followed"
            :user-id="article.aut_id"
            @update-is-followed="article.is_followed=$event"
          ></follow-user> -->
          <follow-user
            v-model="article.is_followed"
            :user-id="article.aut_id"
          ></follow-user>
          <!-- <van-button
            v-if="article.is_followed"
            class="follow-btn"
            round
            :loading="follLoading"
            size="small"
            @click="onFollow"
            >已关注</van-button
          >
          <van-button
            v-else
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            :loading="follLoading"
            size="small"
            icon="plus"
            @click="onFollow"
            >关注</van-button
          > -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div
          class="article-content markdown-body"
          v-html="article.content"
          ref="article-content"
        ></div>
        <van-divider>正文结束</van-divider>
        <!-- 方法二
         <CommentList
          :source="article.art_id"
          @on-load="totalComentCount = $event.total_count"
          ref="CommentList"
          @reoly-click="onReolyClick"
        ></CommentList> -->
        <!-- 方式三 -->
        <CommentList
          :source="article.art_id"
          @on-load="totalComentCount = $event.total_count"
          :list="commentList"
          @reoly-click="onReolyClick"
        ></CommentList>

        <!-- 方式一不推荐 -->
        <!-- 底部区域 -->
        <!-- <div class="article-bottom">
          <van-button class="comment-btn" type="default" round size="small"
            >写评论</van-button
          >
          <van-icon name="comment-o" badge="123" color="#777" />
          <collect-article v-model="article.is_collected"></collect-article>
          <van-icon color="#777" name="good-job-o" />
          <van-icon name="share" color="#777777"></van-icon>
        </div> -->
        <!-- /底部区域 -->
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="errorStatus === 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 底部区域 -->
    <div class="article-bottom" v-if="article.title">
      <van-button
        class="comment-btn"
        type="default"
        round
        size="small"
        @click="isPostShow = true"
        >写评论</van-button
      >
      <van-icon name="comment-o" :badge="totalComentCount" color="#777" />
      <CollectArticle
        v-model="article.is_collected"
        :articleId="article.art_id"
      ></CollectArticle>
      <LikeArticle
        v-model="article.attitude"
        :articleId="article.art_id"
      ></LikeArticle>
      <van-icon name="share" color="#777777"></van-icon>
    </div>
    <!-- /底部区域 -->

    <!-- 弹出层 -->
    <van-popup v-model="isPostShow" position="bottom">
      <CommentPost
        :target="article.art_id"
        @onpost-success="onPostSuccess"
      ></CommentPost>
    </van-popup>
    <!-- 回复弹层 -->
    <van-popup
      v-model="isReplyShow"
      position="bottom"
      :style="{ height: '80%' }"
    >
      <CommentRply
      v-if="isReplyShow"
        @close="isReplyShow = false"
        :comment="currentComment"
      ></CommentRply>
    </van-popup>
    <!-- 弹出层 -->
  </div>
</template>

<script>
// 引入github-markdown-css
import 'github-markdown-css/github-markdown-light.css'
import { getArticleById } from '@/api/article'
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user'
import CollectArticle from '@/components/collect-article'
import LikeArticle from '@/components/like-article'
import CommentList from './components/comment-list'
import CommentPost from './components/comment-post'
import CommentRply from './components/comment-reply'
export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
    CollectArticle,
    LikeArticle,
    CommentList,
    CommentPost,
    CommentRply
  },
  provide () {
    return {
      articleId: this.articleId
    }
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  data () {
    return {
      article: {},
      loading: true, // 是否加载中
      errorStatus: 0, // 错误状态
      totalComentCount: 0,
      isPostShow: false, // 新增评论弹层
      commentList: [], // 把子组件的列表拿到父组件
      isReplyShow: false,
      currentComment: {}
    }
  },
  computed: {},
  watch: {},
  async created () {
    try {
      const { data: { data } } = await getArticleById(this.articleId)
      // if (Math.random() > 0.5) {
      //   throw new function () {
      //     this.response = { status: 500 }
      //   }()
      // }
      this.article = data
      this.loading = false
      // 得到数据之后,渲染页面,异步操作(Promise.then)
      // 同步代码获取页面元素不可以
      // console.log(this.$refs['article-content'])
      // 方式1.用Promise.then
      /*
      const p = new Promise(resolve => resolve())
      p.then(() => {
        console.log(this.$refs['article-content'])
      })
      */
      // 方式2.$nextTick,异步操作(Promise.then)
      /*
      this.$nextTick(() => {
        console.log(this.$refs['article-content'])
      })
      */
      //  方式三
      setTimeout(() => {
        const images = []
        const imgs = this.$refs['article-content'].querySelectorAll('img')
        imgs.forEach((t, i) => {
          images.push(t.src)
          imgs[i].onclick = function () {
            ImagePreview({
              images,
              startPosition: i
            })
          }
        })
      }, 0)
    } catch (e) {
      // console.dir(e)
      this.loading = false
      this.errorStatus = e.response.status === 404 ? 404 : 500
    }
  },
  mounted () {},
  methods: {
    onReolyClick (comment) {
      // console.log(comment)
      this.currentComment = comment
      this.isReplyShow = true
    },
    onPostSuccess (comment) {
      this.isPostShow = false
      // 方式二
      // this.$refs.CommentList.list.unshift(comment)
      // 方式三
      this.commentList.unshift(comment)
    }
  }
}
</script>

<style scoped lang="less">
/deep/ img {
  // width: 100%;
  width: 95vw;
}
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    /deep/ .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
